1,2-Dimethoxy-3-methylcyclopropanes (1)–(3) undergo geometrical isomerization with activation energies of ca. 210 kJ mol–1; comparison with 1-methoxy-2,3-dimethylcyclopropanes (4)–(6) indicates preferred single rotation about the C(1)–C(2) bond.
W. Kirmse and M. Zeppenfeld, J. Chem. Soc., Chem. Commun., 1977, 124 DOI: 10.1039/C39770000124
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